One captivated by unfinished drawing: it was discovered in mould? (10)

Guardian Cryptic #29809 | 5 Down | 2025-09-25
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I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

definition refers to PENICILLIN being discovered in penicillium mould I=”One” inside PENCILLIN-[g]=”unfinished drawing”

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